Having seen companies go bust and then the employees discovered their pension was invested in now worthless company stock I oppose all schemes to get people to invest in their own company without having significant control over the direction. (I didn't directly see this - it was before I was born but I meet a relative who worked there for 20 years) Pension laws now do not allow pensions to invest in company stock like that. Everyone I know who has worked for an employee owned company talks about how much $$$ they have in the company now - none have any other retirement plan and I can't help but think how bad they would be hurt if things went wrong.

If you are not Cxx level at a company or at least in a high role with a reasonable shot of getting to a Cxx position in the near future don't put your money in the company you work for. Diversity is important in investing and the company you work for is the least diverse of all investment options since you could lose both your savings and your paycheck at the same time.

Agreed. If you feel that your company is a good forward-looking investment for whatever reason (appreciation/dividends), it doesn't hurt to keep some holdings--from RSUs or otherwise. Though with transaction costs what they are somewhat per this article/discussion, the right question should probably be "If I had the money in cash, would I buy these shares." Employee stock purchase makes things a bit more complicated depending on the exact terms. Post dot-bomb I got a lot more conservative in terms of holding company stock from RSU/ESPP after a decade with a couple of private firms which doubtless cost me some money but I think I took a reasonable approach overall.

Bad analogy. There are many dimensions in which my experience as a dairy cow may be affected by ownership.

In the case of an investment fund, there's really just customer service and rate of return. If I have a good experience in those dimensions, why should I be concerned with ownership structure?